Hi allI am building a htpc/general use computer and I am looking for sizing help an the power supply.right now the build isa-10 5700 cpuasus F2A85-M PRO mbWD 3tb redkingston 120gb ssd8gb ddr3 (samsung)up to 4 case fans and a cpu fansome sort of optical drive in the future (perhaps not)

I am thinking something it the 3-400w range should be more than enough right? I want to keep a little head room in case I add a discrete gpu in the future. (nothing to crazy)

this will be in the family space so I value a psu that will be on the quiet side.

Take a look at the SPCR review. 100W under heavy load. The Seasonic G 360 would fit well for HTPC use. Probably quiet enough if you put a 100W TDP graphics card in there (HD 7770/ GTX650 Ti). Anything more and the fan ramp up during gaming might be noticable. Less than 100W might be noticable if you cram the PC into an unventilated area.

The Seasonic G-360 is a great PSU. It's reasonable cheap, has great electrical performance, 5 years warranty, and it should be quiet enough for most people, save for a number of die-hard silent PC enthusiasts.

Seasonic has the X400 which is modular and totally passive PSU, if you feel you need 400W. Another option could be to run a PicoPSU, not sure how much the A10 consumes, but probably something like 150XT should handle it.

If not the Seasonics then perhaps an old classic, the Nexus Value 430 W? Only 125 mm in depth (most small PSU's are 140 mm in depth) and extremely quiet. Once received the Editor's Choice award at SPCR but later degraded to being "recommended". Still good though.

If you find the PSU too noisy, and you're up for it, you could try to swap the PSU fan with a quiet one. I did that with great success! My Corsair CX400W (originally reasonably quiet but still audible) is now completely inaudible.

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